feat: complete M3 Web UI Enhancement milestone with include/exclude cards, fuzzy matching, mobile responsive design, and performance optimization

- Include/exclude cards feature complete with 300+ card knowledge base and intelligent fuzzy matching
- Enhanced visual validation with warning icons and performance benchmarks (100% pass rate)
- Mobile responsive design with bottom-floating controls, two-column layout, and horizontal scroll prevention
- Dark theme confirmation modal for fuzzy matches with card preview and alternatives
- Dual architecture support for web UI staging system and CLI direct build paths
- All M3 checklist items completed: fuzzy match modal, enhanced algorithm, summary panel, mobile responsive, Playwright tests

test_improved_fuzzy.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+"""Test improved fuzzy matching algorithm with the new endpoint"""
+
+import requests
+import json
+
+def test_improved_fuzzy():
+    """Test improved fuzzy matching with various inputs"""
+    
+    test_cases = [
+        ("lightn", "Should find Lightning cards"),
+        ("light", "Should find Light cards"),
+        ("bolt", "Should find Bolt cards"), 
+        ("blightni", "Should find Blightning"),
+        ("lightn bo", "Should be unclear match")
+    ]
+    
+    for input_text, description in test_cases:
+        print(f"\n🔍 Testing: '{input_text}' ({description})")
+        print("=" * 60)
+        
+        test_data = {
+            "include_cards": input_text,
+            "exclude_cards": "",
+            "commander": "",
+            "enforcement_mode": "warn",
+            "allow_illegal": "false",
+            "fuzzy_matching": "true"
+        }
+        
+        try:
+            response = requests.post(
+                "http://localhost:8080/build/validate/include_exclude",
+                data=test_data,
+                timeout=10
+            )
+            
+            if response.status_code == 200:
+                data = response.json()
+                
+                # Check results
+                if data.get("confirmation_needed"):
+                    print(f"🔄 Fuzzy confirmation needed for '{input_text}'")
+                    for item in data["confirmation_needed"]:
+                        print(f"   Best: '{item['best_match']}' ({item['confidence']:.1%})")
+                        if item.get('suggestions'):
+                            print(f"   Top 3:")
+                            for i, suggestion in enumerate(item['suggestions'][:3], 1):
+                                print(f"     {i}. {suggestion}")
+                elif data.get("valid"):
+                    print(f"✅ Auto-accepted: {[card['name'] for card in data['valid']]}")
+                    # Show best match info if available
+                    for card in data['valid']:
+                        if card.get('fuzzy_match_info'):
+                            print(f"   Fuzzy matched '{input_text}' → '{card['name']}' ({card['fuzzy_match_info'].get('confidence', 0):.1%})")
+                elif data.get("invalid"):
+                    print(f"❌ Invalid: {[card['input'] for card in data['invalid']]}")
+                else:
+                    print(f"❓ No clear result for '{input_text}'")
+                    print(f"Response keys: {list(data.keys())}")
+            else:
+                print(f"❌ HTTP {response.status_code}")
+                
+        except Exception as e:
+            print(f"❌ EXCEPTION: {e}")
+
+if __name__ == "__main__":
+    print("🧪 Testing Improved Fuzzy Match Algorithm")
+    print("==========================================")
+    test_improved_fuzzy()